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1. (WO1992010741) INSPECTION DEVICE ON THE BASIS OF DARK FIELD ILLUMINATION
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CLAIMS

1. Device for inspecting with dark field illumination objects with at least one transparent portion, for instance glass bottles, which device comprises:
1) illuminating means;
2) positioning means for placing an object such that
that object can be illuminated by the illuminating
means; and
3) a video camera for sensing that object and generating video signals,
which illuminating means and which video camera
are disposed relative to the positioning means
such that the video camera senses no image in
the case of a homogeneous transparent portion
of an object without unhomogeneous parts,
enclosures, bubbles, dirt or other deviations, characterized by
4) imaging means such as at least one positive lens
and/or at least one positive mirror which are placed between the illuminating means and the positioning
means and which image the illuminating means in the vicinity of the objective of the video camera.
2. Device as claimed in claim 1, characterized in that the illuminating means comprise at least two light sources.
3. Device as claimed in claim 1, characterized in that the illuminating means comprise an illuminated part surrounding an unilluminated part.
4. Device as claimed in claim 3, characterized in that the shape of the illuminated part is adapted to the shape of an object for inspection.
5. Device as claimed in claim 1, characterized in that the imaging means comprise a Fresnel lens.